Generally, you can only prove character by general reputation or opinion testimony—not by pointing to specific conduct. But you can discuss specific character conduct when the character trait is an essential element of a claim or defense. And on cross-examination, you can challenge a character witness’s opinion by asking about specific contrary conduct.

Actual Rule

(a) By Reputation or Opinion. When evidence of a person’s character or character trait is admissible, it may be proved by testimony about the person’s reputation or by testimony in the form of an opinion. On cross-examination of the character witness, the court may allow an inquiry into relevant specific instances of the person’s conduct.

(b) By Specific Instances of Conduct. When a person’s character or character trait is an essential element of a charge, claim, or defense, the character or trait may also be proved by relevant specific instances of the person’s conduct.

Selected Committee Notes

The rule deals only with allowable methods of proving character, not with the admissibility of character evidence, which is covered in Rule 404.

Of the three methods of proving character provided by the rule, evidence of specific instances of conduct is the most convincing. At the same time it possesses the greatest capacity to arouse prejudice, to confuse, to surprise, and to consume time. Consequently the rule confines the use of evidence of this kind to cases in which character is, in the strict sense, in issue and hence deserving of a searching inquiry. When character is used circumstantially and hence occupies a lesser status in the case, proof may be only by reputation and opinion. These latter methods are also available when character is in issue. This treatment is, with respect to specific instances of conduct and reputation, conventional contemporary common law doctrine. McCormick §153.

In recognizing opinion as a means of proving character, the rule departs from usual contemporary practice in favor of that of an earlier day. See 7 Wigmore §1986, pointing out that the earlier practice permitted opinion and arguing strongly for evidence based on personal knowledge and belief as contrasted with “the secondhand, irresponsible product of multiplied guesses and gossip which we term ‘reputation’.” It seems likely that the persistence of reputation evidence is due to its largely being opinion in disguise. Traditionally character has been regarded primarily in moral overtones of good and bad: chaste, peaceable, truthful, honest. Nevertheless, on occasion nonmoral considerations crop up, as in the case of the incompetent driver, and this seems bound to happen increasingly. If character is defined as the kind of person one is, then account must be taken of varying ways of arriving at the estimate. These may range from the opinion of the employer who has found the man honest to the opinion of the psychiatrist based upon examination and testing. No effective dividing line exists between character and mental capacity, and the latter traditionally has been provable by opinion.

According to the great majority of cases, on cross-examination inquiry is allowable as to whether the reputation witness has heard of particular instances of conduct pertinent to the trait in question. Michelson v. United States, 335 U.S. 469, 69 S.Ct. 213, 93 L.Ed. 168 (1948); Annot., 47 A.L.R.2d 1258. The theory is that, since the reputation witness relates what he has heard, the inquiry tends to shed light on the accuracy of his hearing and reporting. Accordingly, the opinion witness would be asked whether he knew, as well as whether he had heard. The fact is, of course, that these distinctions are of slight if any practical significance, and the second sentence of subdivision (a) eliminates them as a factor in formulating questions. This recognition of the propriety of inquiring into specific instances of conduct does not circumscribe inquiry otherwise into the bases of opinion and reputation testimony.

The express allowance of inquiry into specific instances of conduct on cross-examination in subdivision (a) and the express allowance of it as part of a case in chief when character is actually in issue in subdivision (b) contemplate that testimony of specific instances is not generally permissible on the direct examination of an ordinary opinion witness to character. Similarly as to witnesses to the character of witnesses under Rule 608(b). Opinion testimony on direct in these situations ought in general to correspond to reputation testimony as now given, i.e., be confined to the nature and extent of observation and acquaintance upon which the opinion is based. See Rule 701.